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URLSearchParams.has & delete() in Node
Introduction to has()
This function returns true or false based upon the query argument. The function will return true if name-value pair exists for the argument.
Syntax
var bool = URLSearchParams.has(name);
It will return TRUE if name is present, else FALSE.
Parameters
The input parameter is a name that needs to be searched in the URL.
Example
// Defining the URL as a constant const myURL = new URL( 'https://example.org/?firstName=John'); // Printing whether the argument exists or not console.log(myURL.searchParams.get('firstName'));
Output
true
Example
// Defining the URL as a constant const myURL = new URL( 'https://example.org/?firstName=John'); // Printing whether the argument exists or not console.log(myURL.searchParams.get('lastName'));
Output
false
Introduction to delete()
It will delete/remove the occurence of the passed argument.
Syntax
URLSearchParams.delete(name);
It will return a modified URL after removing the passed argument.
Parameters
The name is passed that needs to removed from the URL.
Example
// Defining the URL as a constant const params = new URLSearchParams( 'firstName=John&lastName=Chan'); console.log(params.toString); // Removing the 'firstName' parameter params.delete('firstName'); console.log(params.toString());
Output
firstName=John&lastName=Chan lastName=Chan
Example (When arg does not exist)
// Defining the URL as a constant const params = new URLSearchParams( 'firstName=John&lastName=Chan'); console.log(params.toString); // Removing the 'firstName' parameter params.delete('midName'); console.log(params.toString());
Output
firstName=John&lastName=Chan firstName=John&lastName=Chan
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